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Stacks

Header File

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#include <stack>

Operations

• Core Interface

  Operation	Effect
  push()	Inserts an element into the stack
  top()	Returns the next element in the stack (does not remove it)
  pop()	Removes an element from the stack (does not return it)
  size()	Returns the current number of elements
  empty()	Returns whether the stack is empty (equivalent to size()==0)

  Calling top() and pop() for an empty stack always results in undefined behavior. The member functions size() and empty() are provided to check whether the stack contains elements.